\f form feed
\n new line
\r carriage return
\t horizontal tab
\v vertical tab
\\ backslash
\NNN
the character whose ASCII code is NNN (octal); if NNN is not
a valid octal number, it is printed literally.
\xnnn the character whose ASCII code is the hexadecimal value nnn (one to three digits)

echo is a BASH built-in command

Examples

echo "Hello World"

DEMO=Testing123
echo "$DEMO"
# Testing123

echo "with quotes we can echo
several lines at a time"

Echo can also display in color by using Escape sequences for foreground (30..37) and background (40..47) colours.

“The only thing that helps me pass the time away; is knowing I'll be back at Echo Beach some day” ~ Martha and the Muffins

Related:

head - Output the first part of file(s)
less - Display output one screen at a timemore - Display output one screen at a time notify-send - Send desktop notifications
pg - Display one page at a timetee - Redirect output to multiple files
Equivalent Windows command: ECHO - Display message on screen